I've used some 3/8" or 1/2" Rebar cut to 2-3' lengths for a cheap springbar tent stakes while camping at Lake Powell in the sand- seemed to work good. If you go this route, it's a good idea to put those safety caps on to avoid bare foot trauma (just ask my wife 😲). Another idea is to buy/make some fabric bags that you can fill with sand and bury; attach some rope from the buried sandbags to the stake loop & that should hold the tent well.